Electric incandescent lamp.



J. W. PHELPS. ELECTRIC INCANDESGENT LAMP. APPLICATION EILED PEB.17,1904. RENEWED HA3. 5. 1914.

Patented Apr. 28, 1914.

2, is screw-thr aded to engage th a UNITE- Ja s WILEY names, or.nnriaorr, monrean, assrcnon, BY MESN-E ASSIGNMENTS,

ro'ennnnar. ELECTRIC COMPANY,

A CORPORATION OF NEW YORK;

nnnornro INCANDESCENT LAMP.

Specification of Letters Patent.

Patented Apr. 28, 11914.

Application flied February 17, lebeflierial No. 193347. Renewed March 5,1914. Serial No. 822,764.

I '0 ME whom it may concern:

Be it known that 1, JAMES W. Pnnnrs, a citizen of the United States, anda resident of Detroit, county of Vayne, and State of Michigan, haveinvented certain new and useful Improvements in Electric IncandescentLamps, of which the following is declared-to be a full, clear, and exactdescription.

The invention relates more particularly to electric incandescent lampshaving two or more incandescing filaments or filament sections arrangedto emit light of difi'erent intensity, and the improvement seeks toprovide a simple. and eiiective form of such a lamp which requires nospecial form oflampholder, but may beemployed for those already in useand-having asimple and easily operatedswitch mechanism.

In the drawings, Figure 1 is a longitudinal section of the improved lampwith the switchshownat the extreme end of its shift in one direction.Fig. 2 ,is a similar yiew withthe switch shown at the extreme end of itsshift inth opposite direction. Fig. 3 is a iongitiidinal section of theupper part of the lampillustrating a modification. Fig. i is a crosssection on line 4- ofFig. 3 with the filaments and terminalsdiagrammatically illustrated.

The base the. ,lamp may be designed for use in connection withany of thewel known lamp-lnilders. i I the form "show in Fig. l the lamp base isapted ear the dison' t ,pe of holder while the form illustrated in Fig.3"is arranged for the Ediswan lamp-holder. The base or cap; preferablycomprises separatecylindrical metal sections lOand 11 titted one withinthe other secured together in any suitable manner. The glass globeofvacuum bulb 12 is secured wihhin the outer end of the base, 10 by asuitable composition filling 13, while the upper base section 'ljl,shown inFigs, 1 and ro ies" threads the Be e? l mnh der on forms one"thela np-terminals for the reception of current from the lam holder. Aporceiaindislr 1% is secured w thin the outerend of thebase section 11carries aipcentral terininalio i or the reception oi current from thecentral terminal oir'the lanip hoider. D

The switch mechanism is preferably mounted within the base of the lampand for this purpose, a thin insulating plate or supmount 16 by a rivet19. This switch-arm is conveniently formed of a fiat piece of sheetbrass or copper and is provided with an upturned, end 20 to which theflexible operatin' cords 21 are connected.

T e flexible operating cords extend in opposite directions through guideferrules 22 fixed within diametrically opposed openings in the upperportion of the base section 10; These openings are located as shown,below the pivot point 19 of the switch and opposite the lower arm of theswitch to which the operating cords are attached, so that by pulling onthe cords the switch may be shifted to one or the other extremepositions shown in Figs. 1 and 2. The flexible cords 21 hang down fromthe lamp within convenient reach.

Contacts, preferably in the form of flat plates 23 and 2 1, are securedto the face of the'insula'ting support 16 on opposite sides of the pivotof the switch and are adapted to be engaged by the lower and upper armsrespectively of the switch 18. These contacts are so disposed withreference to the switch that, as the latter is shifted from the positionshown in Fig. 1 to that shown in Fig. 2, it will first engage thecontact 23 and subsequently the contact 24. They are however, also sodisposed that when the switch engages the contact 24 it will still be inen agement with contact 23. That is to say t -e relation of the parts issuch that the bg'WlilClh 18 will only make and break eng'ag'ementwiththe contact 24: while it is in engagement with the contact 23.

The lamp is provided with two incandescing filaments or filamentsections 25 and 2b which are preferably of diiierent candle power andarra-nged as shown, one above the otherin the vacuum bulb 12. Thefilaments or filament sections are connected as shown, in series, Theendof the high power filament 25 is connected by the leading-in wiretilt '29 with the contact 24. The switch 18 is connected by theconductor 30 with the lamp .terminal 15. The arrangement and connec--tions ot the filaments may be varied, but that above described is thepreferred arrangeinent.

The lamp is designed for use with electric lighting current of constantor fairly constant potential and filament 26 of low candle power has ahigher resistance per unit of length than the filament 25 so that whenthe current is passed through both filaments in series the low powerfilament 26 will alone glow with small candle power while the high powerfilament 25 acts asa relatively darh resistance and thereby consid'erably cuts down the amount ct current used. l/Vhen the low powerfilament 26 is short-circnited by the switch, the

power filament 25 will glow with full candle power 'lt will be seenthat, in position shown in Fig, 1, the current to the filaments of thelamp is entirely interrupted and the lamp will remain dark. its theswitch is shitted in one direction to the position drown in 2, it willsuccessively engage the contacts 23 and 24.. Assoon as it' engages thecontact 23 the current will pass from lamp terminal by leading-in wire30, to switch 18 by contact 23 and leadingin wire 28,

through the filaments 26 and in series by the leadin -in wire .2? :tothe other lamp terminal. the low power filament will then glow withsmall candle power as above described. Upon further movement of theswitch in the same direction, it will engage the contact 241: and thecurrent will pass through. the high power filament alone "Irom terminal15, by leadin -in wire 30, contactand ca 18 leadi' in wire 22 throughthe ower filament 25 alone and baclr terminal by the leading-in 'aposition the low power filad or short-circnl since when the switch makesand breaks with the contact 24, since this operation merely serves toclose and open a short-circuit around the low power filament. In thisway, the simple noiseless form or switch shown can be safely employed.Preferably, the switch is provided at its opposite ends wit-h punchmarks 31 to form raised portions upon the lace ot the switch whichengages the flat contacts 23 and 2%, so that good contact may be madetherewith.

' The form of lamp shown in Figs. 3 and lis adapted for use inconnect-ion with the Ediswan sockets or lamp-holders. For this purposethe base section 11 is provided with oppositely extending projections 32adapted to engage with the bayonet slots of the Ediswan lamp-holder andthe porcelain disk It at the end of the base, is provided with twoterminals 33 and 3% for engagement with the corresponding terminals ofthat type of lamp-holder. The insulating support for the switch is inthe form cat a disk 16 ot' fiber or other. suitable material and rests,as indicated, in horizontal position upon a ledge 17 in the lowerbasesection 10. The arrangement of the switch 18, cont acts 23 and 2tand filaments 25 and 26 is similar to that shown in Figs. 1 and 2. The

switch 18 is connected by leading-in wire with the lamp-terminal 3t, andleadingin wire 27" extending through an opening the disk 16 connects theend of the high power filament 25 with the other lamp terminal 28.. Theend of the low power filament 26 and the oined ends of the filaments arerespectively connected by the leading-in wires 22 and 29 with thecontacts 23 and 2t,v

as in the form shown in Fig. 1.- it will be noted that the switch -18 ispivoted on the dish 16' to one side of the center and to one side of thediametrical line between the openings through which the operating cords21 pass so that-the switch may be shifted by the cords to and from theposition shown in 4;. As the switch is shifted iiroin such position,itwill first engage with the contact 23 and then with contact 24, sothat the lamp will first glow with small candle power and then. with llcandle power. @n the return movement of he switch the lamp will first beturned do: and then out. [is

"he form previously d scribed,

arranged z W 23 and are only in break t eections e rip e :rorm

n a :3 t (which is con memes Having described my invention, what I claimas new and desire to secure by Letters Patent, is z 1. In" constantpotential electric lighting,

the combination with an electric incandescent lamp having twoincandescing filaments connected in series, the resistance of whichbeing so proportioned that one glows and the other acts as a relativelydark resistance when the current flows through them in contacts beingrelatively s0 arranged that said switch member will make and breakengagement with said second contact only when in engagement with theother of said contacts.

2. An electric incandescent lamp having two filaments in series, a basefor said lamp provided withmeans for detachably engaging a lamp holderand with terminals for the reception of current therefrom and a switchcarried by said base comprising a movable switch member connected to oneof said terminals and .a pair of contacts connected. respectively to theend of one of said filaments and to the joined ends of said filaments,said switch member and switch con tacts being relatively so arrangedthat said switch member will make and break engagement with said secondcontact only when in engagement with the other of said contacts.

3. An electric incandescent lamp having a plurality of filaments, a basesecured thereto and provided with means for detachably engaging alamp-holder, an insulating support within said base, a switch arm pvoted to said insulating support and connected to one of thelamp-terminals, separate contacts on said insulating support arranged tobe successively engaged by said switch arm and connected respectively tothe end of one or i said filaments and to the joined endsof saidfilaments, said switch and switch contacts being relatively so arrangedthat said switch member will make and break engagement with said secondcontact only while in engagement with the other of said contacts andflexible operating cords connected to said switch and extending throughguide openings in the sides of said base.

a. An electric incandescent lamp having a base provided with means fordetachably engaging a lamp-holder, an insulating plate within said base,a switch-arm pivoted between its ends to said insulating plate, separatecontacts on opposite sides of said pivot arranged to be. suitablyengaged by said switch, operating cords connected to said switch-arm andguide openings for said cords on the sides of said base arranged out ofline with said pivot.

5. An electric lamp comprising a bulb having a hollow stem, a base atthe neck of the bulb, an insulated post carried by the base andconducting the current from the socket carrying the bulb, a series ofinsulated leading-in wires extending from the base through the stem,lighting filaments having each one endin electriccircuit with acorresponding leading-in wire, their opposite ends coupled to a commonwire in electric connection with the base and a swinging arm or switchmounted about the post and adapted to successively engage the terminalsof the leading-in wires. (5.111 an electric incandescent lamp having twofilaments, a base secured to said lamp having means for detachablyengaging a suitable lamp holder and having terminals for the receptionof current therefrom, said base being formed of separate cylindricalmetal shells one fitting within the other and permanently securedtogether, an insulating support within said base, a switch arm andcontacts all mounted on said support, connections leading from the lampterminals to said filaments and to said switch arm and contacts wherebythe movement of said arm will control and modify the flow of currentthrough said filaments and flexible operating cords connected to saidswitch arm and extending through guide openings in the wall of saidbase, substantially 'as described.

'7. An electric incandescent lamp having a base'provided with means fordetachably engaging a suitable lampholder and terminals for thereception of current therefrom. an insulating support within said base,a switch arm pivoted to said insulating support, separate contacts alsomounted on said common support arranged to be successively engaged bysaid switch arm and flexible operatiugcords connected thereto and extending outside of said base.

8. inelecti'ioincandescent lamp having a base provided with means fordetachably engaging a suitable lamp holder and terminals for thereception of current therefrom, said base being-formed of separatesections permanently secured together, an insulating support within saidbase, a movable switch member and contacts all mounted on said support,and flexible operatingv cords con nected to said switch member andextending through guide openings in the wall of said base. substantiallyas described.

9. An electric incandescent lamp comprising a bulb having a hollow stem,a base at the neck of the bulb comprising inner and outer cylindricalmetal shells secured to- Elli outer shell a central lamp terminal onsaid insulating dislr, two filaments Within said bulb, a switchinterposed between and electrically connected to said filaments and saidlamp terminals and comprising a pivoted switch arm and a pair 01":contacts arranged to be successively engaged by said switch-a1'n1, said.switch-arm and contacts being arranged Within said base upon a corn nooninsulating support, and flexible operating cords connected to saidswitch-arm and extending through openings in the inner portion of saidbase substantially as do scribed. v

, 10. lln constant potential electric lighting,

the combination. With a suitable lamp holder,

of an electric incandescent lamp having two filaments connected inseries, the resistance of which is so proportioned that one glows andthe other acts as a relatively dark sistance when'the current tloWsthrough the filaments in series, a for said lamp having means fordetachably engaging the lamp holder and terminals for the reception ofcurrent therefrom, the free end of one of said filaments beingconnected. to one ct said lamp terminals, a switch member mounted on thelamp base and connected by the-other lamp terminal and a pair or?contacts mounted on the lamp base and connected respectively to the treeend of the other filament and to the joined ends of said filaments, saidswitch member being arranged to successively engage said contacts as itis shifted in one direction, substantially as described.

11. tor electric incandescent lamps comprisingmeans for detacliablyengaging lamp holder, an insulating "plate Within said base, aswitch-arm pivoted between its ends on said insulating plate, separatecontacts on opposite sides, of said pivot to be suital'ily engaged bysaid switch, operatnoaegree ing members connected to said switch-arm,and guide openings tor said members on the sides of said base arrangedout of line With said pivot.

12. A base for electric incandescent lamps comprising means fordetachably engaging a suitable lamp holder and terminals for thereception of current therefrom, an insulating support Within said base,a switch-arm pivoted on said insulating support, separate contacts alsomounted on said common support arranged to be successively engaged bysaid switch-arm, and operating members connected to said switch-arm andextending outside oil said base.

13.. rl base tor electric incandescent lamps comprising means fordetachably engaging a suitable lamp holder and terminals tor thereception oicurrent theretrom, said base being formed of separateconnections perinanently secured together, an insulating support Withinsaid base, a movable switch member and contacts all mounted on saidsupport, and operating members connected rill (iii

to said switch member and extending inside off said base.

it. A base tor electric incandescent lamps carrying terminals andcomprising therein an insulating support, a movable conducting switchmember connected to one of said terminals and mounted on said support,arate contacts also mounted on said support and arranged. to besuccessively engaged by said switch member, the aforesaid parts beingrelatively so arranged that said switch member will make and breakengagement With a certain one of said contacts only n'hile in engagementwith the other of said contacts. a

and Willi; if renters.

